cpu.h

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    1 /*
    2  * Copyright (c) Facebook, Inc.
    3  * All rights reserved.
    4  *
    5  * This source code is licensed under both the BSD-style license (found in the
    6  * LICENSE file in the root directory of this source tree) and the GPLv2 (found
    7  * in the COPYING file in the root directory of this source tree).
    8  * You may select, at your option, one of the above-listed licenses.
    9  */
   10 
   11 #ifndef ZSTD_COMMON_CPU_H
   12 #define ZSTD_COMMON_CPU_H
   13 
   14 /**
   15  * Implementation taken from folly/CpuId.h
   16  * https://github.com/facebook/folly/blob/master/folly/CpuId.h
   17  */
   18 
   19 #include "mem.h"
   20 
   21 #ifdef _MSC_VER
   22 #include <intrin.h>
   23 #endif
   24 
   25 typedef struct {
   26     U32 f1c;
   27     U32 f1d;
   28     U32 f7b;
   29     U32 f7c;
   30 } ZSTD_cpuid_t;
   31 
   32 MEM_STATIC ZSTD_cpuid_t ZSTD_cpuid(void) {
   33     U32 f1c = 0;
   34     U32 f1d = 0;
   35     U32 f7b = 0;
   36     U32 f7c = 0;
   37 #if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_IX86))
   38     int reg[4];
   39     __cpuid((int*)reg, 0);
   40     {
   41         int const n = reg[0];
   42         if (n >= 1) {
   43             __cpuid((int*)reg, 1);
   44             f1c = (U32)reg[2];
   45             f1d = (U32)reg[3];
   46         }
   47         if (n >= 7) {
   48             __cpuidex((int*)reg, 7, 0);
   49             f7b = (U32)reg[1];
   50             f7c = (U32)reg[2];
   51         }
   52     }
   53 #elif defined(__i386__) && defined(__PIC__) && !defined(__clang__) && defined(__GNUC__)
   54     /* The following block like the normal cpuid branch below, but gcc
   55      * reserves ebx for use of its pic register so we must specially
   56      * handle the save and restore to avoid clobbering the register
   57      */
   58     U32 n;
   59     __asm__(
   60         "pushl %%ebx\n\t"
   61         "cpuid\n\t"
   62         "popl %%ebx\n\t"
   63         : "=a"(n)
   64         : "a"(0)
   65         : "ecx", "edx");
   66     if (n >= 1) {
   67       U32 f1a;
   68       __asm__(
   69           "pushl %%ebx\n\t"
   70           "cpuid\n\t"
   71           "popl %%ebx\n\t"
   72           : "=a"(f1a), "=c"(f1c), "=d"(f1d)
   73           : "a"(1));
   74     }
   75     if (n >= 7) {
   76       __asm__(
   77           "pushl %%ebx\n\t"
   78           "cpuid\n\t"
   79           "movl %%ebx, %%eax\n\t"
   80           "popl %%ebx"
   81           : "=a"(f7b), "=c"(f7c)
   82           : "a"(7), "c"(0)
   83           : "edx");
   84     }
   85 #elif defined(__x86_64__) || defined(_M_X64) || defined(__i386__)
   86     U32 n;
   87     __asm__("cpuid" : "=a"(n) : "a"(0) : "ebx", "ecx", "edx");
   88     if (n >= 1) {
   89       U32 f1a;
   90       __asm__("cpuid" : "=a"(f1a), "=c"(f1c), "=d"(f1d) : "a"(1) : "ebx");
   91     }
   92     if (n >= 7) {
   93       U32 f7a;
   94       __asm__("cpuid"
   95               : "=a"(f7a), "=b"(f7b), "=c"(f7c)
   96               : "a"(7), "c"(0)
   97               : "edx");
   98     }
   99 #endif
  100     {
  101         ZSTD_cpuid_t cpuid;
  102         cpuid.f1c = f1c;
  103         cpuid.f1d = f1d;
  104         cpuid.f7b = f7b;
  105         cpuid.f7c = f7c;
  106         return cpuid;
  107     }
  108 }
  109 
  110 #define X(name, r, bit)                                                        \
  111   MEM_STATIC int ZSTD_cpuid_##name(ZSTD_cpuid_t const cpuid) {                 \
  112     return ((cpuid.r) & (1U << bit)) != 0;                                     \
  113   }
  114 
  115 /* cpuid(1): Processor Info and Feature Bits. */
  116 #define C(name, bit) X(name, f1c, bit)
  117   C(sse3, 0)
  118   C(pclmuldq, 1)
  119   C(dtes64, 2)
  120   C(monitor, 3)
  121   C(dscpl, 4)
  122   C(vmx, 5)
  123   C(smx, 6)
  124   C(eist, 7)
  125   C(tm2, 8)
  126   C(ssse3, 9)
  127   C(cnxtid, 10)
  128   C(fma, 12)
  129   C(cx16, 13)
  130   C(xtpr, 14)
  131   C(pdcm, 15)
  132   C(pcid, 17)
  133   C(dca, 18)
  134   C(sse41, 19)
  135   C(sse42, 20)
  136   C(x2apic, 21)
  137   C(movbe, 22)
  138   C(popcnt, 23)
  139   C(tscdeadline, 24)
  140   C(aes, 25)
  141   C(xsave, 26)
  142   C(osxsave, 27)
  143   C(avx, 28)
  144   C(f16c, 29)
  145   C(rdrand, 30)
  146 #undef C
  147 #define D(name, bit) X(name, f1d, bit)
  148   D(fpu, 0)
  149   D(vme, 1)
  150   D(de, 2)
  151   D(pse, 3)
  152   D(tsc, 4)
  153   D(msr, 5)
  154   D(pae, 6)
  155   D(mce, 7)
  156   D(cx8, 8)
  157   D(apic, 9)
  158   D(sep, 11)
  159   D(mtrr, 12)
  160   D(pge, 13)
  161   D(mca, 14)
  162   D(cmov, 15)
  163   D(pat, 16)
  164   D(pse36, 17)
  165   D(psn, 18)
  166   D(clfsh, 19)
  167   D(ds, 21)
  168   D(acpi, 22)
  169   D(mmx, 23)
  170   D(fxsr, 24)
  171   D(sse, 25)
  172   D(sse2, 26)
  173   D(ss, 27)
  174   D(htt, 28)
  175   D(tm, 29)
  176   D(pbe, 31)
  177 #undef D
  178 
  179 /* cpuid(7): Extended Features. */
  180 #define B(name, bit) X(name, f7b, bit)
  181   B(bmi1, 3)
  182   B(hle, 4)
  183   B(avx2, 5)
  184   B(smep, 7)
  185   B(bmi2, 8)
  186   B(erms, 9)
  187   B(invpcid, 10)
  188   B(rtm, 11)
  189   B(mpx, 14)
  190   B(avx512f, 16)
  191   B(avx512dq, 17)
  192   B(rdseed, 18)
  193   B(adx, 19)
  194   B(smap, 20)
  195   B(avx512ifma, 21)
  196   B(pcommit, 22)
  197   B(clflushopt, 23)
  198   B(clwb, 24)
  199   B(avx512pf, 26)
  200   B(avx512er, 27)
  201   B(avx512cd, 28)
  202   B(sha, 29)
  203   B(avx512bw, 30)
  204   B(avx512vl, 31)
  205 #undef B
  206 #define C(name, bit) X(name, f7c, bit)
  207   C(prefetchwt1, 0)
  208   C(avx512vbmi, 1)
  209 #undef C
  210 
  211 #undef X
  212 
  213 #endif /* ZSTD_COMMON_CPU_H */

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FreeBSD/Linux Kernel Cross Reference sys/contrib/zstd/lib/common/cpu.h

FreeBSD/Linux Kernel Cross Reference
sys/contrib/zstd/lib/common/cpu.h